Magnetic coupling of iron-based ferromagnetic nanoclusters encapsulated inside double-wall carbon nanotubes

Author(s)
Wilson Nieto, Johnny Chimborazo, Hidetsugu Shiozawa, Thomas Pichler, Paola Ayala, Dario Niebieskikwiat
Abstract

Understanding the magnetic properties of hybrids of carbon nanotubes is an intriguing matter that offers a vastly unexplored playground for fundamental research and promising applications. The magnetic properties of bundles of double-wall carbon nanotubes encapsulating cementite ferromagnetic nanoclusters (of ∼ 3–4 nm in length) are here studied. VSM magnetometry shows clear evidence of interparticle magnetic interactions and a large interface exchange coupling of the nanoclusters with the carbon matrix, characterized by a surface anisotropy field HK∼67 kOe. Using a well-known measurement protocol, a magnetic activation volume for magnetization reversal was estimated as ∼420nm3. This large volume involves around 270 cementite nanoparticles mutually coupled through the conduction electrons of the nanotubes, which provide the ground for a large magnetic correlation length, thus favoring their possible application in spintronic devices.

Organisation(s)
Electronic Properties of Materials
External organisation(s)
Universidad San Francisco de Quito
Journal
Carbon Trends
Volume
19
No. of pages
6
ISSN
0008-6223
DOI
https://doi.org/10.1016/j.cartre.2025.100483
Publication date
04-2025
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Keywords
ASJC Scopus subject areas
Chemistry (miscellaneous), Materials Science (miscellaneous), Materials Chemistry
Portal url
https://ucrisportal.univie.ac.at/en/publications/6faed187-676c-4dc9-a990-122707ad9062